The bulb that is listed for the car has two lights in the one bulb. A sidelight and a brake light, so if you take the bulb out you will see two terminals down in the bottom of the holder to line up with two solder dots on the bulb? Because the two lights are of different strength, 5W for the side and 21W for the stop, you can only put the bulb in in certain position. This is controlled by staggered pins on the bulb.
http://bit.ly/15yzpf0
But if you look in and only see one terminal, I'm mistaken and its a dedicated bulb for the stop lights.
http://bit.ly/18SiqZv
Hope I didn't over complicate the thing on you ................